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lenses for nearsighted people are lenses thin in the center but get thicker at the edge of that center zone. to correct farsightedness, lenses have a thick center that tapers down by at the edge of the optical zone. because standard lenses are free to rotate as they sit on the eye''s surface, they can''t correct for astigmatism, a condition in which the cornea doesn''t have a spherical shape. astigmatic eyes require toric lenses, which mail have different contact lens powers lenses along different axes of vision. recently, lens designers have produced contacts for astigmatism. by making the outer part of the lens, called the carrier portion, thicker on one side than the other, the manufacturer can ensure by that the correction stays in line with the axis mail of irregular vision. as the wearer blinks and the lens moves, the thicker, heavier part stays at the bottom, ensuring that the lens is oriented correctly. these contacts have become widely available within contact the lenses past 2 years.

lenses for nearsighted people are lenses thin in the center but get thicker at the edge of that center zone. to correct farsightedness, lenses have a thick center that tapers down by at the edge of the optical zone. because standard lenses are free to rotate as they sit on the eye''s surface, they can''t correct for astigmatism, a condition in which the cornea doesn''t have a spherical shape. astigmatic eyes require toric lenses, which mail have different contact lens powers lenses along different axes of vision. recently, lens designers have produced contacts for astigmatism. by making the outer part of the lens, called the carrier portion, thicker on one side than the other, the manufacturer can ensure by that the correction stays in line with the axis mail of irregular vision. as the wearer blinks and the lens moves, the thicker, heavier part stays at the bottom, ensuring that the lens is oriented correctly. these contacts have become widely available within contact the lenses past 2 years.

the water carries dissolved oxygen through these lenses to the eye surface, says an optometrist and head of clinical affairs at ciba vision. "the eye needs oxygen to keep the tissue healthy." by a high water content also makes soft lenses more comfortable. people blink about every 5 seconds, and a wet lens surface reduces the friction between the eyelid and the plastic. for mail 20 years, most of the innovations in soft lenses boosted the hydrogel''s water content. this approach has its limits, though. too much water makes the lens fragile and difficult to handle. contact lens wearers become frustrated trying to slide a floppy lens from a fingertip to an eye. moreover, contact even if a lens could be made of a layer of pure water, it wouldn''t get lenses enough oxygen to the eye. by researchers decided to find new polymers that could allow greater oxygen flow.

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